Connected: An Internet Encyclopedia
RFC 1123 - 5.3.5 Domain Name Support

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### 5.3.5 Domain Name Support

SMTP implementations MUST use the mechanism defined in Section 6.1 for mapping between domain names and IP addresses. This means that every Internet SMTP MUST include support for the Internet DNS.

In particular, a sender-SMTP MUST support the MX record scheme [SMTP:3]. See also Section 7.4 of [DNS:2] for information on domain name support for SMTP.

Next: 5.3.6 Mailing Lists and Aliases

Connected: An Internet Encyclopedia
RFC 1123 - 5.3.5 Domain Name Support